The patch titled
Subject: genwqe: fix MAX_ORDER usage
has been added to the -mm mm-unstable branch. Its filename is
genwqe-fix-max_order-usage.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/genwqe-fix-max_order-usage.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: genwqe: fix MAX_ORDER usage
Date: Wed, 15 Mar 2023 14:31:28 +0300
MAX_ORDER is not inclusive: the maximum allocation order buddy allocator
can deliver is MAX_ORDER-1.
Fix MAX_ORDER usage in genwqe driver.
Link: https://lkml.kernel.org/r/20230315113133.11326-6-kirill.shutemov@xxxxxxxxxxxxxxx
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Frank Haverkamp <haver@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/misc/genwqe/card_dev.c | 2 +-
drivers/misc/genwqe/card_utils.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/misc/genwqe/card_dev.c~genwqe-fix-max_order-usage
+++ a/drivers/misc/genwqe/card_dev.c
@@ -443,7 +443,7 @@ static int genwqe_mmap(struct file *filp
if (vsize == 0)
return -EINVAL;
- if (get_order(vsize) > MAX_ORDER)
+ if (get_order(vsize) >= MAX_ORDER)
return -ENOMEM;
dma_map = kzalloc(sizeof(struct dma_mapping), GFP_KERNEL);
--- a/drivers/misc/genwqe/card_utils.c~genwqe-fix-max_order-usage
+++ a/drivers/misc/genwqe/card_utils.c
@@ -308,7 +308,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_
sgl->write = write;
sgl->sgl_size = genwqe_sgl_size(sgl->nr_pages);
- if (get_order(sgl->sgl_size) > MAX_ORDER) {
+ if (get_order(sgl->sgl_size) >= MAX_ORDER) {
dev_err(&pci_dev->dev,
"[%s] err: too much memory requested!\n", __func__);
return ret;
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
sparc-mm-fix-max_order-usage-in-tsb_grow.patch
um-fix-max_order-usage-in-linux_main.patch
floppy-fix-max_order-usage.patch
drm-i915-fix-max_order-usage-in-i915_gem_object_get_pages_internal.patch
genwqe-fix-max_order-usage.patch
perf-core-fix-max_order-usage-in-rb_alloc_aux_page.patch
mm-page_reporting-fix-max_order-usage-in-page_reporting_register.patch
mm-slub-fix-max_order-usage-in-calculate_order.patch
iommu-fix-max_order-usage-in-__iommu_dma_alloc_pages.patch
mm-treewide-redefine-max_order-sanely.patch
